A slag cement-free ceramic tile adhesive and a method for preparing the same

Abstract

The application discloses a kind of slag cement-free base ceramic tile bonding agent, by the following components by mass percentage: slag powder 20~50%, sand 30~70%, heavy calcium powder 0~20%, water retaining agent 0.1~0.5%, redispersible emulsion powder 0.1~3%, thixotropic agent 0.01~0.1%, activator 0.1~5%.The application also discloses its preparation method.The application removes cement as formula raw material, provides cementing main material by adding activator to slag powder to carry out activity excitation, then utilizes water retaining agent, redispersible emulsion powder, thixotropic agent, sand and the like to improve the physicochemical performance of entire slag cement-free base ceramic tile bonding agent, on the one hand makes slag cement-free base ceramic tile bonding agent meet C1T standard of JC / T547-2017, on the other hand does not use cement, but uses slag powder made of solid waste blast furnace water quenching slag, can reduce raw material cost, simultaneously save resources, energy and protect environment.

Description

Technical Field

[0001] This invention relates to the field of ceramic tile adhesive technology, specifically to a slag-based cement-free ceramic tile adhesive and its preparation method. Background Technology

[0002] Tile adhesives are typically formulated using ordinary silicate cement as the binder. Silicate cement itself is characterized by high bonding strength, good weather resistance, and short curing time. Therefore, silicate cement is the preferred material for formulating cementitious materials in tile adhesives. Cement-based tile adhesive formulations vary widely, all of which improve the performance of the tile adhesive by adding additives to optimize the poor physical and chemical properties of cement itself or properties it lacks.

[0003] On the one hand, due to the high price of cement, the amount of cement added must be considered when formulating tile adhesives. On the other hand, the firing of cement requires the consumption of mineral resources and a large amount of energy, making it a high-energy-consuming material. Slag powder, on the other hand, is a solid waste material with lower energy consumption than cement, thus protecting the environment and conserving resources and energy. However, there is currently no mature formula for cement-free tile adhesives.

[0004] Therefore, designing a slag-based cement-free tile adhesive that can reduce the cost of tile adhesive formulation while ensuring good adhesion and strength is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a slag-based cement-free ceramic tile adhesive and its preparation method to overcome the shortcomings of the prior art.

[0006] The present invention adopts the following technical solution: A slag-based cement-free ceramic tile adhesive, comprising the following components by weight percentage: Slag powder 20-50% Sand 30-70% Heavy calcium carbonate powder 0-20% Water-retaining agent 0.1-0.5% Redispersible latex powder 0.1–3% Thixotropic agent 0.01–0.1% Activator 0.1-5%.

[0007] Furthermore, by mass percentage, it consists of the following components: Slag powder 35-50% Sand 40-62% Calcium carbonate powder 0-10% Water-retaining agent 0.2-0.3% Redispersible latex powder 1-1.5% Thixotropic agent 0.05–0.1% Activator 1.5-4%.

[0008] Furthermore, the slag powder is S95 grade slag powder, which is obtained by drying and grinding blast furnace water-quenched slag.

[0009] Furthermore, the sand is 50-100 mesh river sand.

[0010] Furthermore, the superphosphate powder is 150-200 mesh superphosphate powder.

[0011] Furthermore, the water-retaining agent is hydroxypropyl methylcellulose or hydroxyethyl methylcellulose, and the viscosity of the water-retaining agent is 40,000 to 100,000 mPa·s.

[0012] Furthermore, the redispersible latex powder is one or more of the following: vinyl acetate-ethylene copolymer powder, vinyl acetate-higher fatty acid ethylene copolymer powder, vinyl acetate-ethylene-higher fatty acid ethylene ternary copolymer powder, vinyl acetate-acrylate-higher fatty acid ethylene ternary copolymer powder, and acrylic homopolymer powder.

[0013] Furthermore, the thixotropic agent is one or more of bentonite, starch ether, and polyacrylamide.

[0014] Furthermore, the activator is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, gypsum, sodium aluminate, and sodium sulfate.

[0015] The preparation method of the above-mentioned slag cement-free tile adhesive includes the following steps: according to the formula amount, slag powder and sand are mixed evenly or slag powder, sand and heavy calcium carbonate powder are mixed evenly, and then water-retaining agent, redispersible latex powder, thixotropic agent and activator are added in sequence and mixed evenly to obtain the slag cement-free tile adhesive; When applying, the slag cement-free ceramic tile adhesive and water are mixed at a mass ratio of 1:0.2 to 0.4 and then molded.

[0016] The beneficial effects of this invention are: 1. The slag-based cement-free tile adhesive of the present invention removes cement as a raw material in its formulation. It provides the main cementitious material by adding an activator to slag powder to activate its properties. Water-retaining agents, redispersible latex powder, thixotropic agents, and sand are then used to improve the overall physicochemical properties of the slag-based cement-free tile adhesive. On the one hand, the prepared slag-based cement-free tile adhesive meets the C1T standard of JC / T547-2017, effectively ensuring the effectiveness, stability, and reliability of its use (slag hydration reaction lasts longer, and its strength can still increase in the later stages, while cement-based adhesives are prone to strength decline due to carbonization and other reasons). On the other hand, since no cement is used, and slag powder obtained from solid waste blast furnace water-quenched slag is used, the raw material cost of the slag-based cement-free tile adhesive can be reduced. Simultaneously, the absence of cement reduces carbon emissions and resource and energy consumption from cement production, and utilizes solid waste materials for resource recovery, thereby achieving resource and energy conservation and environmental protection. This aligns with the trend of green building materials and has significant socio-economic value.

[0017] 2. After being activated by an activator, the aluminosilicate materials in the slag powder of this invention react with the activator to generate hydrated calcium silicate and hydrated calcium aluminosilicate, which have a cementing effect and provide bonding strength. The slag powder is obtained by drying and grinding blast furnace water-quenched slag, utilizing the solid waste material blast furnace water-quenched slag, reducing the raw material cost of slag-based cement-free tile adhesives, saving resources and energy, and protecting the environment. The activator of this invention can activate the slag powder, giving it cementing properties. The activator provides the driving force for the hydration reaction of slag powder, while the high surface area of ​​slag powder (S95 grade slag powder ≥400m² / kg) provides sufficient interface for the reaction. The combination of the two can replace the cementitious function of cement, and the hydration products are more stable and have stronger resistance to carbonation and sulfate corrosion (slag hydration alkalinity is weaker than cement). In addition, the hydration shrinkage rate of slag powder is much lower than that of cement (cement-based shrinkage rate is about 0.04%, slag-based shrinkage rate is about 0.02%), which can reduce the hollowing and falling off of tiles caused by shrinkage.

[0018] This invention relates to a redispersible latex powder that enhances adhesion, flexibility, and durability through film formation. The invention provides an inorganic cementitious main material by adding an activator to slag powder to activate it, while the redispersible latex powder provides an organic cementitious material. The polymer film of the redispersible latex powder and the inorganic cementitious material generated from the hydration of slag powder form an organic-inorganic composite network. The inorganic phase provides rigidity and strength, while the organic phase provides flexibility. This solves the problem of excessive rigidity and cracking in traditional cement-based tile adhesives, and improves the fatigue resistance of tile adhesives.

[0019] This invention's water-retaining agent can regulate the rate of moisture release, maintaining suitable humidity during the curing process of slag-based cement-free ceramic tile adhesive and enhancing bonding strength. The water-retaining agent locks in moisture that both meets the hydration requirements of slag powder and provides a medium for the dispersion of latex powder.

[0020] This invention's thixotropic agent improves the anti-slip properties, workability, and application feel of slag-based cement-free tile adhesive. The thixotropic agent exhibits static thickening and dynamic thinning characteristics (when static, it forms a three-dimensional network structure, making the system paste-like; during application, the network is disrupted, thinning the system for easier handling; after application, the network rebuilds, preventing slippage and hollowing caused by tile adhesive flow after bonding), ensuring water retention without affecting application smoothness. The thixotropic agent works synergistically with the water-retaining agent to balance the contradiction between "easy application" and "non-collapse," adapting to different application environments (such as different temperatures and humidity levels) and providing a longer open time (the time for the tile to adjust after application).

[0021] In this invention, sand is used as aggregate to provide skeletal support and reduce the shrinkage rate of the system. Alternatively, heavy calcium carbonate powder can be used as filler, with sand forming the coarse skeletal support system. The heavy calcium carbonate powder fills the fine voids; the combination of these two materials reduces the system's porosity and increases its density, further saving costs while maintaining strength. Detailed Implementation

[0022] The present invention will be further explained below with reference to the embodiments. The following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the following embodiments, the slag powder was purchased from Shanghai Baotian New Building Materials Co., Ltd., and it is S95 grade slag powder, obtained by drying and grinding blast furnace water-quenched slag; the sand was purchased from Shanghai Caoyuan Building Materials Trading Co., Ltd., and it is river sand with a mesh size of 50-100 mesh; the heavy calcium carbonate powder was purchased from Zhejiang Zhuji Tongyanshan Mining Co., Ltd., and its mesh size is 150-200 mesh; the water-retaining agent is hydroxypropyl methylcellulose, purchased from Shanghai Huiguang Fine Chemical Co., Ltd., and its viscosity is 40000 mp. a.s. The redispersible latex powder is vinyl acetate-ethylene copolymer powder, purchased from Celanese Corporation, USA, with a glass transition temperature (Tg) of approximately 15°C and a residue of <5% on a 55-mesh sieve; the thixotropic agent is cassava starch ether, purchased from Guangdong Longhu Technology Co., Ltd., with a residue of ≤1% on a 40-mesh sieve; the activator is sodium silicate, purchased from Qingdao Haiwan Chemical Co., Ltd., with a modulus (i.e., the mass ratio of Na2O to SiO2) of 1.2 or 1.6 and a residue of ≤1% on a 40-mesh sieve.

[0024] Example 1

[0025] A slag-based cement-free ceramic tile adhesive, comprising the following components by weight percentage: 40% slag powder Sand 56.2% Water-retaining agent 0.25% 1.5% redispersible latex powder Thixotropic agent 0.05% Activator (modulus 1.2) 2%.

[0026] The preparation method of the slag cement-free tile adhesive is as follows: according to the formula, slag powder and sand are mixed evenly, and then water-retaining agent, redispersible latex powder, thixotropic agent and activator are added in sequence and mixed evenly to obtain the slag cement-free tile adhesive.

[0027] Example 2

[0028] A slag-based cement-free ceramic tile adhesive, comprising the following components by weight percentage: 50% slag powder Sand 45.45% Water-retaining agent 0.3% Redispersible latex powder 1.2% Thixotropic agent 0.05% Activator (modulus 1.2) 3%.

[0029] The preparation method of the slag cement-free tile adhesive is as follows: according to the formula, slag powder and sand are mixed evenly, and then water-retaining agent, redispersible latex powder, thixotropic agent and activator are added in sequence and mixed evenly to obtain the slag cement-free tile adhesive.

[0030] Example 3

[0031] A slag-based cement-free ceramic tile adhesive, comprising the following components by weight percentage: 35% slag powder Sand 61.53% Water-retaining agent 0.22% 1.5% redispersible latex powder Thixotropic agent 0.05% Activator (modulus 1.2) 1.7%.

[0032] The preparation method of the slag cement-free tile adhesive is as follows: according to the formula, slag powder and sand are mixed evenly, and then water-retaining agent, redispersible latex powder, thixotropic agent and activator are added in sequence and mixed evenly to obtain the slag cement-free tile adhesive.

[0033] Example 4

[0034] A slag-based cement-free ceramic tile adhesive, comprising the following components by weight percentage: 40% slag powder Sand 55.6% Water-retaining agent 0.25% 1.5% redispersible latex powder Thixotropic agent 0.05% Activator (modulus 1.6) 2.6%.

[0035] The preparation method of the slag cement-free tile adhesive is as follows: according to the formula, slag powder and sand are mixed evenly, and then water-retaining agent, redispersible latex powder, thixotropic agent and activator are added in sequence and mixed evenly to obtain the slag cement-free tile adhesive.

[0036] Example 5

[0037] A slag-based cement-free ceramic tile adhesive, comprising the following components by weight percentage: 45% slag powder Sand 50.38% Water-retaining agent 0.27% Redispersible latex powder 1.3% Thixotropic agent 0.05% Activator (modulus 1.6) 3%.

[0038] The preparation method of the slag cement-free tile adhesive is as follows: according to the formula, slag powder and sand are mixed evenly, and then water-retaining agent, redispersible latex powder, thixotropic agent and activator are added in sequence and mixed evenly to obtain the slag cement-free tile adhesive.

[0039] Example 6

[0040] A slag-based cement-free ceramic tile adhesive, comprising the following components by weight percentage: 40% slag powder Sand 44.7% 10% heavy calcium powder Water-retaining agent 0.25% 1.5% redispersible latex powder Thixotropic agent 0.05% Activator (modulus 1.6) 3.5%.

[0041] The preparation method of this embodiment is as follows: according to the formula, slag powder, sand and heavy calcium carbonate powder are mixed evenly, and then water-retaining agent, redispersible latex powder, thixotropic agent and activator are added in sequence and mixed evenly to obtain the slag cement-free ceramic tile adhesive.

[0042] The slag-based cement-free tile adhesives of Examples 1-6 were tested as follows: The slag-based cement-free tile adhesive and water were mixed at a mass ratio of 4:1, stirred evenly, and allowed to mature for 5 minutes. After stirring for another minute, the adhesive was applied to the wall surface and the back of the tile using a comb-like technique. The tile was leveled and compacted during installation. The adhesive strength of the slag-based cement-free tile adhesive was tested according to the Class C technical requirements of JC / T547-2017 "Ceramic Tile Adhesives".

[0043]

[0044] The results are shown in Table 1. All indicators of the slag cement-free tile adhesive prepared in each embodiment of the present invention meet the requirements of the tile adhesive industry standard (C1T standard of JC / T547-2017), can achieve a strong bonding effect, and significantly reduce the preparation cost.

Claims

1. A slag-based cement-free ceramic tile adhesive, characterized in that, By mass percentage, it consists of the following components: Slag powder 20-50% Sand 30-70% Heavy calcium carbonate powder 0-20% Water-retaining agent 0.1-0.5% Redispersible latex powder 0.1–3% Thixotropic agent 0.01–0.1% Activator 0.1-5%.

2. The slag-based cement-free ceramic tile adhesive according to claim 1, characterized in that, By mass percentage, it consists of the following components: Slag powder 35-50% Sand 40-62% Calcium carbonate powder 0-10% Water-retaining agent 0.2-0.3% Redispersible latex powder 1-1.5% Thixotropic agent 0.05–0.1% Activator 1.5-4%.

3. A slag-based cement-free ceramic tile adhesive according to claim 1 or 2, characterized in that, The slag powder is S95 grade slag powder, which is obtained by drying and grinding blast furnace water-quenched slag.

4. A slag-based cement-free ceramic tile adhesive according to claim 1 or 2, characterized in that, The sand is 50-100 mesh river sand.

5. A slag-based cement-free ceramic tile adhesive according to claim 1 or 2, characterized in that, The supercalcium carbonate powder is 150-200 mesh supercalcium carbonate powder.

6. A slag-based cement-free ceramic tile adhesive according to claim 1 or 2, characterized in that, The water-retaining agent is hydroxypropyl methylcellulose or hydroxyethyl methylcellulose, and the viscosity of the water-retaining agent is 40,000 to 100,000 mPa·s.

7. A slag-based cement-free ceramic tile adhesive according to claim 1 or 2, characterized in that, The redispersible latex powder is one or more of the following: vinyl acetate-ethylene copolymer powder, vinyl acetate-higher fatty acid ethylene copolymer powder, vinyl acetate-ethylene-higher fatty acid ethylene ternary copolymer powder, vinyl acetate-acrylate-higher fatty acid ethylene ternary copolymer powder, and acrylic homopolymer powder.

8. A slag-based cement-free ceramic tile adhesive according to claim 1 or 2, characterized in that, The thixotropic agent is one or more of bentonite, starch ether, and polyacrylamide.

9. A slag-based cement-free ceramic tile adhesive according to claim 1 or 2, characterized in that, The activator is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, gypsum, sodium aluminate, and sodium sulfate.

10. A method for preparing a slag-based cement-free ceramic tile adhesive according to any one of claims 1 to 9, characterized in that, The process includes the following steps: according to the formula, mix slag powder and sand evenly, or mix slag powder, sand and heavy calcium carbonate powder evenly, and then add water-retaining agent, redispersible latex powder, thixotropic agent and activator in sequence and mix evenly to obtain the slag cement-free ceramic tile adhesive; When applying, the slag cement-free ceramic tile adhesive and water are mixed at a mass ratio of 1:0.2 to 0.4 and then molded.

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